Home Made Guitar Amps

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Home Made Guitar Amps

This is a group for home made guitar amps.

Members: 202
Latest Activity: 1 hour ago

Discussion Forum

Combo Amp Build

Started by Paul Craig. Last reply by Scott aka Farmer Ted 1 hour ago. 87 Replies

I'm building a Combo Amp for someone.The cabinet is Pine 13" wide x 15" tall and 11" deep. All glued together and used a 1/2" roundover bit in my router for the edges.The speaker is a vintage 10"…Continue

Kalamazoo Model 1 Deluxe

Started by Scott aka Farmer Ted. Last reply by GARAGE HERMIT on Thursday. 9 Replies

It's been a while since I have built any guitars. A new passion has taken my attentions...restoring vintage tube amplifiers.A few months ago I found a vintage tube amp chassis on Ebay. Compulsion…Continue

Matching Amp ohms and Speaker Impedance

Started by Wayfinder. Last reply by Paul Craig Apr 7. 4 Replies

I started this discussion in the main chat area and Scott generously answered... and I soon realized this really warrants a discussion all its own.  So I've copied the original discussion from main,…Continue

Bass Cabinet project

Started by Murdoc_420. Last reply by Murdoc_420 Apr 2. 18 Replies

 Ok, so I built my first CBB, now I want a portable amp.==Disclaimer: I have no idea what I'm doing!!! So any and all advice is greatly appreciated== I found a good box at the Cigar Shop recently:…Continue

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Comment by Wayfinder on April 7, 2016 at 9:39am

I found a very good page that shows how to match odd amp/speaker combos.  Very illustrative:

http://www.crutchfield.com/S-igAtyrKv2me/learn/how-to-match-subwoof...

Comment by Wayfinder on April 7, 2016 at 9:25am

Thanks Scott.  Great illustration.  I appreciate the research.  If you do happen to come across any info regarding adding a resistor / whatever to get them balanced, let me know.  I'm sure it's got to be a simple solution... but my knowledge of electricity is pretty much limited to "don't stand in water and touch the hot wire".   :D

And a little about pots and diodes now.  Slowly but surely...

Comment by Scott aka Farmer Ted on April 7, 2016 at 9:05am

Way,

I spent some time this morning researching this issue. As I understand it, using the 6 ohm speaker with the 8 ohm amp module will be okay at any volume. But the overall effect would be less tone and volume. This is because of the mismatched impedance. 

Think of it this way: the amp is a garden hose, and you want to send the water flow (amplified guitar signal) across the yard (through the amp). Turn on the valve, and the water (voltage/pressure) flows through the hose. If there is no nozzle (speaker) to restrict the water flow (voltage/pressure), the water streams out unobstructed (no ohms). Add a nozzle (speaker impedance) and open it partly...the water comes out under pressure (voltage) and emits further than without the nozzle...but not quite across the yard. Adjust the nozzle to the optimum setting, the water shoots out to the desired point across the yard.

Effectively, using a 6 ohm speaker on the 8 ohm module will make the output section of the amp draw more current, resulting in more heat dissipation in the components, especially if there is a transistor.

I was unable to find any info about adding components (resistors, etc) to the speaker leads to effectively change/match the impedance.

However, you will likely have no trouble simply using the speaker as-is.

Comment by Wayfinder on April 6, 2016 at 11:21pm

Okay, that helps.  Explains the difference between impedance and resistance (I'd been wondering)   the question still remains-- how do I match that 8 ohm amp to a 6 ohm speaker?

Comment by Scott aka Farmer Ted on April 6, 2016 at 7:58pm

Whoa, my head just exploded.

Comment by Scott aka Farmer Ted on April 6, 2016 at 7:57pm

Wayfinder,

One might assume that simply adding a 2 ohm resistor between the amplifier and the 6 ohm speaker would make a total of 8 ohms. But the speaker is valued in "impedance". And while impedance and resistance are calculated in similar fashion, impedance is relative to alternating current, resistance is relative to direct current.

The guitar signal input to the amp and the output to the speaker is alternating current. The power inside the amplifier is direct current. Both AC and DC power can co-exist within the same wire/circuit line. But DC cannot pass through a capacitor.

Comment by Wayfinder on April 6, 2016 at 6:45pm

A basic question.   I've already looked up answers on Google but want to verify here--  and perhaps get better info.

I have an 8 ohm 2 watt amp and want to use it with a 10" 6 ohm speaker.  Is there a way to do so to even the two out?

The answer I've found so far is, "Don't turn up the volume to full and you won't have to worry about the 8 ohms"... which sounds reasonable.  But is there something I could hook up between the amp and speaker (or vise versa) that would make the amp and speaker compatible?  Thanks in advance!

Comment by Mickey Ray Parker on March 29, 2016 at 11:33am
Right on. Thanks!
Comment by Wayfinder on March 29, 2016 at 8:28am

Ah then, that's no problem.  Like Scott said, just hook them both into the same line.  If you don't have 2 items plugged in at the same time it's like having two spouts to the same gas tank.  You can use either one.

Comment by Mickey Ray Parker on March 29, 2016 at 1:59am
I just want to use one at a time. Looking at my previous comment, I wasn't that clear.
 

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Discussion Forum

Combo Amp Build

Started by Paul Craig. Last reply by Scott aka Farmer Ted 1 hour ago. 87 Replies

Kalamazoo Model 1 Deluxe

Started by Scott aka Farmer Ted. Last reply by GARAGE HERMIT on Thursday. 9 Replies

Matching Amp ohms and Speaker Impedance

Started by Wayfinder. Last reply by Paul Craig Apr 7. 4 Replies

Bass Cabinet project

Started by Murdoc_420. Last reply by Murdoc_420 Apr 2. 18 Replies

Dual IM386 Chip amp

Started by Paul Craig. Last reply by Paul Craig Mar 31. 22 Replies

Trying to get a "bigger" sound

Started by Ian Schroth. Last reply by Blind Lemon Cello Mar 16. 31 Replies

Jana MJ-13400 Public Address amplifier

Started by Monterey. Last reply by Wayfinder Mar 15. 3 Replies

TDA2030A Amp

Started by Bama Hound. Last reply by TruckDrivingFool Sep 23, 2015. 12 Replies

Mini-amp plans needed.

Started by Rev Mike. Last reply by BrianQ. Jul 4, 2015. 4 Replies

Will this work for an amp?

Started by Monterey. Last reply by Wayfinder May 19, 2015. 4 Replies

Radio conversion too quiet

Started by Slow Slough Guitars. Last reply by wes carl May 10, 2015. 5 Replies

Amp

Started by Truth Instruments. Last reply by Truth Instruments Apr 18, 2015. 3 Replies

First amp

Started by Daryl. Last reply by Wayfinder Dec 21, 2014. 13 Replies

Why the Ruby is a great first amp build

Started by jamie howe. Last reply by Dr X Oct 21, 2014. 2 Replies

Discussing transformers

Started by Darren Addy. Last reply by Blind Lemon Cello Aug 12, 2014. 3 Replies

On Board CBG Amp

Started by Chuck Cobillas. Last reply by Darren Addy May 27, 2014. 8 Replies

Ruby Amp - Stock and Bassman

Started by Manny Lopez. Last reply by Scott aka Farmer Ted Jan 6, 2014. 11 Replies

Speaker size and effect on small Amps

Started by Thomas "Duck" Petry. Last reply by Glenn Kaiser Sep 15, 2013. 4 Replies

Artec amps with unknown speaker ?

Started by Bluesheart. Last reply by Jeff McFadden Sep 14, 2013. 10 Replies

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